A taskforce has been formed and a renewed search is under way for missing four-year-old Gus Lamont.

Gus was last seen about 5pm on Saturday, September 27 at his family's homestead Oak Park Station in remote South Australia, about 40km south of Yunta.

The search was called off earlier this month after no trace of Gus was found during a intensive six-day search.

Police have today resumed the search and launched Taskforce Horizon to investigate Gus' disappearance.

Dozens of police and around 80 Australian Defence Force (ADF) personel are now socuring the remote terrain in SA's mid-north.

SA Police Commissioner Grant Stevens said no stone would be left unturned in the search for Gus.

"We are dedicated to making sure we do everything we possibly can to bring Gus back to his family,

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